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From: Duncan Sands <baldrick@wanadoo.fr>
To: zlatko.calusic@iskon.hr
Cc: Alessandro Suardi <alessandro.suardi@oracle.com>,
	Hugh Dickins <hugh@veritas.com>, Andrew Morton <akpm@digeo.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Re: Shared memory shmat/dt not working well in 2.5.x
Date: Tue, 8 Oct 2002 17:25:56 +0200	[thread overview]
Message-ID: <200210081725.57017.baldrick@wanadoo.fr> (raw)
In-Reply-To: <dnhefx9db8.fsf@magla.zg.iskon.hr>

> > Hmmm, are you using ext3?  Changes to the meaning of yield sometimes
> > make fsync go very slowly.  This problem has been around since 2.5.28,
> > and hasn't yet been fixed (As for a fix, Andrew Morton said "I'll sit
> > tight for the while, see where shed_yield() behaviour ends up").
>
> Yes, it's an ext3 partition, ordered mode. I don't have ext2 compiled
> into kernel anymore. :)
>
> Hm, if it's a problem with fsync() then that could explain slight
> Oracle slowdown, too, as I think that Oracle is a heavy user of
> fsync. But I don't know that for sure. I'll investigate further..

Andrew Morton made this suggestion to me:

>Please try replacing the yield() in fs/jbd/transaction.c
>with
>
>        set_current_state(TASK_RUNNING);
>        schedule();

and indeed it cured my problems.

All the best,

Duncan.

  reply	other threads:[~2002-10-08 15:20 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-10-01  9:52 Shared memory shmat/dt not working well in 2.5.x Zlatko Calusic
2002-10-01 13:07 ` Alessandro Suardi
2002-10-01 13:09 ` [PATCH] " Hugh Dickins
2002-10-01 13:28   ` Alessandro Suardi
2002-10-01 13:46     ` Zlatko Calusic
2002-10-01 14:51       ` Alessandro Suardi
2002-10-01 14:59         ` Zlatko Calusic
2002-10-02 18:45         ` Zlatko Calusic
2002-10-08 11:22           ` Zlatko Calusic
2002-10-08 11:38             ` Duncan Sands
2002-10-08 15:10               ` Zlatko Calusic
2002-10-08 15:25                 ` Duncan Sands [this message]
2002-10-01 13:37   ` Zlatko Calusic
2002-10-01 15:32 ` [PATCH] Oracle startup split_vma fix Hugh Dickins

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